Subject: RE: Accepting packets on a multi-access interface owned by BGMP

From: "Dave Thaler" <[email-masked]>
Date: Thu, 12 Apr 2001 19:02:04 -0700

I think you're right in that the text needs to be changed to
cover the downstream case.

Thanks,
-Dave

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]]
> Sent: Thursday, April 12, 2001 6:37 PM
> To: Dave Thaler; [email-masked]; [email-masked]; [email-masked]
> Subject: Accepting packets on a multi-access interface owned by BGMP
> 
> 
> Hi all,
> 
>      Section 5.2 of the latest BGMP spec 
> (draft-ietf-bgmp--spec-02.txt)
> specifies the following rules on accepting packets arrived on 
> an interface owned
> by BGMP:
> 
> (1) If the packet was received over a point-to-point 
> interface owned by BGMP,
> the packet is accepted.
> 
> (2) If the packet arrived on a multiaccess network interface 
> owned by BGMP, the
> packet is accepted if it is receiving data on a 
> source-specific branch, if it is
> the designated forwarder for the longest matching route for 
> S, or for the
> longest matching route for the nominal root of G.
> 
> The second rule is for multiaccess network.  But it seems to 
> me that this rule
> will only work for packets being forwarded upstream toward 
> the root of the tree.
> For packets being forwarded down the tree, the downstream 
> border router will not
> be the designated forwarder. So packets travelling downstream 
> will not be
> accepted.  Am I missing something here??
> 
> 
> Thanks,
> James Huang
> 
> 
> 
> 
>